Bar stool



FIG. 1 is a perspective view of a bar stool showing my design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a right elevation side view thereof, the left elevation side view being a mirror image;

FIG. 4 is a back elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a bar stool, as shown and described. 